Pneumatic vibratory motor



Oct. 21, 1958 Filed June '7, 1957 A.J.KROECKEL ETAL PNEUMATIC VIBRATORY MOTOR Oct. 21, 1958 A. J. KROECKEL ET AL PNEUMATIC VIBRATORY MOTOR 2 Sheets-Sheet 2 4 Filed June 7, 1957 'l 6 F/G. 2.

A T TOR/VE Y United States Patent() PNEUMATIC VIBRATORY MOTCR Alfred J. Kroeckel, North Hollywood, and Russell C.

Smith, La Crescenta, Calif., assgnors to Viber Company, Burbank, Calif., a corporation of California Application June 7, 1957, Serial No. 664,330

6 Claims. (Cl. 259-1) This invention relates to a vibratory motor of the eccentric weight type arranged for attachment to molds, bins, and the like, and in particular to a pneumatic motor vibrator having a throughshaft which drives adjustable eccentric weights which are mounted on the vibrator housing on both ends of the motor.

. One object of the invention is to provide a unitary pneumatic motor driven rotary vibrator having adjustable eccentric weights mounted for rotation on both ends of the motor. Another object is to provide a rotary vibrator having eccentric weights of adjustable eccentricity disposed apart so that the character of the vibration may be altered over a wide range. Another object is to provide a double eccentric weight vibrator whose eccentric weights are separately adjustable as to eccentricity and orientation. A further object is to provide a novel means of mounting motor-shaft driven eccentric weights on the Vibrator housing.

These and other objects are attained by our invention which will be understood from the following description, reference being made to the accompanying 'drawings in which:

Fig. 1 is a longitudinal sectional view corresponding to section line 1-1 of Figs. 2 and 3;

Fig. 2 is a cross-sectional view taken on the line 2--2 of Fig. 1; and p Fig. 3 is a cross-sectional View taken on the line 3-3 of Fig. 1.

Referring to the drawings showing a preferred form of the invention, our vibratory motor consists generally of `a housing 10, having end closures 11, and also having mounting feet 12 for supporting the device on the object to be vibrated. Within the housing is mounted a vanetype pneumatic motor 13, including a rotor 14 with integral shaft 15, being held thereon by the key 16. The

body 17 of the motor consists of a cylinder 18 having a. cylindrical opening 19 in which the rotor 14 rotates, the axis of the opening being preferably disposed away from the axis of the body cylinder 18 to provide a thickcned wall for the intake manifold. The cylinder 18 is provided with end liner plates 20 which are held in abutting position by bearing blocks 21 in which ball bearings 22 for the rotor shaft 15 are mounted, said bearing blocks also positioning the motor in the housing 10. The bearing blocks are attached to the cylinder 18 by bolts 37, and the end closures 11 for the housing are held to the housing 10 by bolts 23 in the peripheral edge of the end plates.

The rotor 14 is a solid cylinder having radial slots 24 extending from end to end of the cylinder, said slots being adapted to contain the movable vanes 25 which slide in and out of the slots as the rotor revolves, following the wall of opening 19. The axis of the rotor shaft 1S is disposed parallel to, but off center, relative to the cylindrical opening 19. The compressed air for actuation of the pneumatic motor enters through the threaded inlet 26 in the housing 10, this inlet communicating with the distributing duct 27', through which the compressed air 2,857,143 Patented Oct. 21, 1958 ICC enters the ports 28 and actuates the rotor. Discharge ports 29 are provided on the opposite side of the motor, the discharged air owing through the exhaust passage 30. Double-walled cap members 31 are provided on each end of the motor, bein'g held in position on the housing end plates 11 by the lbolts 23. The exhaust air passes around the inside wall 32 of the cap members 31 and is exhausted to the air through exhaust ports 33, after serving to cool the cap members 31 and the eccentric weight 38 and bearings therefor mounted therein.

Each end of the through-shaft 15 is provided with an extension shaft 34 which is smaller than the throughshaft and is attached thereto in a hole 35 in said throughshaft end, there being keys 36 to hold the shafts together.

Operatively attached to each of the extension shafts 34 is an adjustable cup-shaped eccentric weight member 38, each eccentric weight member consisting of an outer shallow cylinder 39 having an integral end closure plate 4l)l which is provided with an inwardly directed axial boss 41 having an axial hole 42 adapted to receive the extension shaft 34 to which it is operatively held by the key 36. A bearing mounting hub 44 is provided extending outwardly from the end plate 11 of the housing 10, said hub having a central opening 45 into which the extension shaft 34 4and the axial boss 41 extend. The bearing-mounting hub 44 on its outer cylindrical surface is arranged and finished to receive and seat the inner race 48 of a ball bearing unit 46 including the outer race 47 and the balls 49, there being a holding ring 51 in a groove 52 to hold the inner race 48 in place. The outer race 47 is mounted inside an eccentrically weighted closure 40, which is attached in end-to-end relation to the outer shallow cylinder 39 by bolts 58 extending longitudinally through the closure 40 into threaded holes 59 spaced around the peripheral contacting face 60 of the cylinder 39. The eccentrically weighted cylinder 39 is provided with an opening 56 which is eccentric to the outer cylindrical surface so that one side of the cylinder is thick and heavy and the opposite side is relatively thin and light weight. The integral end closure plate 40 of the outer shallow cylinder 39 is cut away so that one segmental portion 61 of it is about half the thickness of the other portion, thus providing eccentric weighting when it is rotated. The angular positioning and the magnitude of the eccentric weighting of each eccentric weight member 38 may be adjusted by the orientation of the integral end closure plate 40 relative to the eccentrically weighted cylinder 39, eight threaded holes 59 equally spaced angularly around the periphery being provided. By selection of the relative positions of maximum unbalanced weight in the end closure plate 40 and the cylinder 39, the total out-of-balance weight of each weight member 38 may be adjusted, with the bolts 58 and threaded holes 59 holding the unit in the selected orientation. Also, the angular disposition of the eccentric weights on either end of the motor determines whether the two eccentric weight units function at the same angular position, or `are partly or totally opposed to each other. By these means of adjustment, rst of the weight eccentricity of each of the weight members 38, and the angular orientation of the two weights, the character and magnitude of the vibrations produced when the weights are rotated may he selected.

The eccentric weight members 38 are enclosed between the end plates 21 and the end caps 31 which are attached to the end plates 21 by threaded bolts 23. A screw plugged opening 62 is provided in each end cap 34 for the introduction of lubricating oil.

The supporting of the eccentric weight units 38 on the bearing mounting hubs 44, which are a part of the end plates 11, as distinguished from direct mounting of the eccentric weights directly on the shaft extensions 34, provides many advantages. Thevibrationsfof the housing are produced directly, instead of through the shaft supporting bearings, for example shaft bearings 22. The principall advantage, however, is inthe much longer wear of the` ball,i bearings when so mounted. Mechanicali vibrators` are designed' to. operate: at very high: speeds,v for example 10,000' P; M1., andreplacement of worn out ball-` bearings, including balls, races. and lball separators, isV one of the` major maintenance expenses.y By more rigidly supporting the eccentric weight members directly on: the housing' itself, much of the wear of bearings because of the hammering action of the vibrations is avoided.

The many advantages of our invention will be apparent fromr the above description. Particularly, the' adjustability of' the two weightsboth as torelativel orientation aswell asamount of'eccentricity, permits theproduction of vibrations* of many degrees of amplitude and frequency. By mounting the two. eccentric weights at opposite angular positions, the frequency of vibration may be` doubled, or by mounting them on the shaft with the same. orientation, the eccentric weight may be doubled. Also, each; Weight, may ybeV readily adjusted for variousdegrees of eccentricity.

We claim:

l-. A4 pneumatic vibratory` motor comprising a housing having endl closures, each. of said end closures having arr outwardly directed axial hub; a rotaryy pneumatic mo.- toroperatively mounted within said housing,A said motor including a through-shaft andi bearings. for saidshaft mounted onl saidend closures; a cup-shaped eccentric weight member mounted for rotation on= its inner cylindrical surface on a ball-bearing lsupported on the outer cylindrical face of eachV of= said axial hubs on'. said end closures; and shaft extensions connecting saidl motor through-shaft with the axisA of each of said weight; members.

2f. A` pneumatic vibratory motor comprising a housingfhaving end closures, each of said end closures having.

Aan outwardly directed axial' hub; a. rotary pneumatic motorl having a through-shaft operatively# mounted with in said housing, saidl pneumatic motor including endblocks held to saidendV closures on the inner side thereof, and bearings for said through-shaft mounted in said end blocks; a' cup-shaped eccentric weight member mounted for rotation. on its' inner surface on a ball-bearing snpported on the outer cylindrical face of each of said axial hubs on said enclosures; shaft extensions connecting an end of said motor shaft with the axis of each of said weight members; land a cap member attached to the. out,- side. of each: of said end closures, said cap members enclosing said eccentric weight members and their bearings,

said cap members being externally in communicationwith the exhaust of said 'pneumatic motor whereby the exhaust air passes `around said caps and cools said eccentric weight bearings.

3. The vibratory motor defined in claim l in which the eccentric weight means are adjustable in effective eccentricity.

4. The vibratory motor -defined in claim 2 in which each of the eccentric weight means comprises a shallow cylinder having an end closure, said end closure having an internal central boss with an axial hole arranged to be keyed to an extension shaft, said end closure being eccentrically weighted; an eccentrically weighted cylinder mounted in end-to-end relation to said closed end cylinder; `and attachment means spaced around said cylinders whereby said eccentrically weighted cylinder may =be selectively oriented relative to the eccentrically Weighted shallow cylinder end closure.

5. In a rotary pneumatic vibratory motor having ashaft and eccentric weights operativelyv connected to the ends of the motor shaft, said eccentric: weights including adijustable eccentric means each comprising a shallowy cylin'- der having an end closure,` saidl end closure having an= internal central boss arranged to be operatively' connected to one end of the motor shaft, said end closure being eccentrically'weighted; an eccentrically weighted* open cylinder mounted in end-to-end relation to said closed end: cylinder; and means spaced around said cylinders whereby said eccentrically weighted cylinder may be selectively' oriented. relative to the eccentrically weighted shallow cylinder endll closure.

6. In ay rotary vibratory motor having a shaft yand eccentric weights operatively connected to the ends of the motor shaft, said eccentric weights including adjustable eccentric means each comprising a shallowl cylinder having an end c1osuresadk end closure having an internal central boss with `an axial: hole arranged to be keyedto an extension of the motor shaft, said endclosure being eccentrically weighted; an eccentrically Weighted open cylinder mountedl in end-to-end relation to said closed end cylinder; and means spaced around said; cylinderswherebyl said eccentrically weighted cylinder may be selectively oriented relative to the eccentrically weighted shallow cylinder end closure.

References Cited in the le of this patent- UNITED STATES PATENTS 1,943,076 Jackson J'an. 9; 1934 2,059,239l Jackson Nov. 3`, 1936' 2,501,158 Chil'cott Mar; 21', 1950l 

